Reciprocating bed-motion of printing and analogous machines.



No. 862,309. PATENTED AUG. 6, 1907.

E. T. OLEATHERO.

REGIPROOATING BED MOTION OF PRINTING AND ANALOGOUS MACHINES.

APPLICATION FILED JULY 7, 1905.

EDWARD T. CLEATHERO, OF ALTRINCHAM, ENGLAND.

RECIPROCATING BED-MOTION OF PRINTING AND ANALOGOUS MACHINES.

Specification of Letters Patent.

Patented Aug. 6, 1907.

Application filed July 7,1905. Serial No. 268,889.

To all whom it may concern: Be it known that I, EDWARD THOMAS CLEATHERO, a subject of the King of Great Britain and Ireland, and

i a resident of the Hollies, Barrington Road, Altrincham,

in the county of Chester, England, have invented certain new, and useful Improvements in Reciprocating Bed-Motionsof Printing and Analogous Machines, of

which the following isa specification.

This invention relates to mechanism for converting rotary into reciprocating motion, and more especially for slowing down and reversing the reciprocating bed movement in printing presses, and it has for its object to provide mechanism of simple construction, by which a constant speed is given to the bedduring impression, and by which unequal strainsupon the bed are avoided in the transmission, and in which, the slowing down and reversal is effected by means which are'durable and incapable of being deleteriously affected by the wear to which the parts are subjected in use. i

The invention is more particularly applicable to gear such as described in the specification of the prior British Letters patent granted to me No. 14268 of 1897, but the invention is of general application.

According to the invention, 1 provide aslide to which I communicate a reciprocating movement fromsome part of the press mechanism, the motion being communicated in a movement of rotation at the same speed as that of the bed, or of that part of the mechanism with which the slide engages at or about the middle of its stroke, whereby the movement of the bed may be slowed down, reversed, and an accelerating return movement given to it until it reaches the speed of the ,main driving mechanism of the bed, so that thus the incidental strains in reversing are taken up by the slide, and are not communicated to the driving mechanism proper by which the reciprocating movements are communicated to the bed. According to the invention moreover I provide the slide to engage with the gear wheel which meshes with the bed rack, to which gear wheela rotary reciprocating movement is communicated by suitable drivinggear, and for the purpose I advantageously provide a wrist-pin upon it having of a printing press to which the, invention is applied the figure being a longitudinal section on the lines ZZ of Fig. 2 which is a plan corresponding to Fig. 1 in which the cylinder and the bed are omitted. 1

Referring to the drawings, a and b represent the usual side frames of a printing machine, 0 the type bed, 4 the cylinder, e inking rollers, f and 9 cross stays or girders for securing the two side frames together, h and i the fast and loose driving pulleys, j its shaft, k spur pinion fast on the shaft j l and m are .a' pair of spur wheels fast respectively on shafts n and 0 turning in suitable bearings in the side frame a and bearing bracket p. These spur wheels are of the same diameter and gear with each other, their motion being derived from the pinion k which engages one of them;

' q and r, are a pair'of mutilated spur wheels, having teeth on one thirdof their peripheries, the other two thirds being mutilated or cut away, these wheels are also fast upon the shafts n and 0 respectively with their toothed surfaces on opposite sides of their respective shafts.

s is the shaft by which the bed is driven, and is mounted to turn in suitable bearings of the .side frame a and bracket bearing p equidistant of the two shafts ndirection of rotation on the part of that pinion t being alternate to correspond with the direction of the respective wheel engaging-with it for the time being. The bed 0 partakes that alternate motion by means of the spur wheel 11. and the rack 2) already described.

. The present invention it will be understood does not relate to the construction so far described.

On the spur wheel u the crank pin 'w and roller :1 as shown on Fig. 1 has entered the slotted recess 3 of the yoked bracket z as the mutilated wheel r leaves the pinion t, the spur wheel u by means of the pin 11; engaged by the yoked bracketz commences to first slow down the motion .of the bed gradually to a full stop and gradually.starts it in the reverse direction up to the peripheral speed of the mutilated spur wheel q and the pinion t when they engage with each other and cont inue the bed motion in the opposite direction at a uniform speed until it nears the end of its travel, when the I length of the toothed surface engaging with it. The

crank pin engagesin the slotted recess y and slows down and reverses the bed again. The yoked bracket z is carried in slide guides AB and is driven by the crank pin C connectedto the disk E mounted on the shaft F'with the fast spur pinion wheelG in gear with the spur wheel] the proportionate ratio of, the pinion Wheel G being three revolutions to one of the spur wheel I. The yoked bracket travels three times in each direction to the travel of the bed once in each direction.

It will be understood that as the last teeth of the mutilated wheel are leaving the pinion t, as indicated by the direction of the arrows on Fig'. l, the pinw engages the yoked sliding bracket z in the recessed slot y, and the pin G attached to the disk E arrives at its top central position, the maximum speed of travel of the yoked sliding bracket ibeing'then attained in synchronism'with the peripheral speed of the pin to, when the disk, moving to the next quarter of its revolution, slows the bed down to stop, and reverses gradually to full speed on the pin 0 reaching the bottom-central position of the slotted guide H. The wheelqhasby then engaged the pinion t and the pin to moves out of engagement with the yoked sliding bracket. 1

The wheels q-'r fixedon their respective shafts at opposite positions to. each other and having teeth on one third only of their peripheral area there is nearly one sixth of their periphery when neither wheel is in gear with piniont during each halfrevolution of the wheels q-1; during this portion of disengagement the yoked sliding bracket z has engagedgthe pin to on wheel 1L and' accomplished the act of reversing the motions of travel when the opposite wheel engages in gear with'the-pim;

ion tand drives the bed. v 7 Having describedmy improvements-in one .form in accordance with the drawings attached I may modify the gearing and positions of the yoked sliding bracket,

instead of a sliding yokcd'b racket I may usea rocking bracket or sector yoked to a crank pin and twofracks mutilated gear wheels for givingsnid gear wheel a rotary reciprocation and means to engage said slide with said gear wheel during :1 portion of each iinlly as described;

revolution substangiven, a bed, :1 gear wheel gearing with the hed e pair of mutilated gear wheels for giving to said gear wheel a,r0-,

fury reciprocation. and a wrist pin nndsloticonnection between said'slide and said gear wheeldul'ing'a-{portion .of each revolution substantially as described; 1 v

In mechanism for converting rotary 'into; recipro: carting motion, a bed, a gear whcel gearing; vitlilthe bed, a

. pair of mutilated gearwheels for giving to siiid-geargwheel rotary reciprocation, a slide tofwhich three reciprOca-J tions are given for each reciprocation of the bed, and means to engage said slide with said gear ,wheel during a portion of each revolution substantially'as described.

'4. In mechanism for converting rotary into reciprocatory motion, a slide to whichn reciprocati-ngl'inotion' is' given, a bed, a gear wheel gearing with the bed, a pair ofg mntilated gear wheels for givingto said gear wheel a ro- -tai'yreciprocation, and a wrist pin and slot connection between said slide described. i r V V 5. In .mechanism for converting rotary into recipro catory motion, a bed, a gear wheel gearing with thejhe'd, a pair'of mutilated gear wheels for giving to said gear" wheel and s'aidlgear wheels substantially as a rotary reciprocation. a slide 'to which three reciproczt tions are given for each reciprocation of the bed, and a.

wrist pin and slot connection between said slide and said gear wheel substantially as described. 7

'In testimony whereof'I have signed my nazneto this specification. r 1

Witnesses: J 7

WILLIAM EDWARD EVANS, j Gii v'rnnn Lnnwre' Liivnsrx- In mechanism for converting rotary into reciprocatory motiom'n slide to which a reciprocating motion is T. CLEATHERO. 

